str="str"
str2="str2"
print(str,str2)
# 加号/乘号
print(str+str2)
print(str*10)

# in: 返回True or False,是一个索引函数；ctrl点击可以看文档

print('s' in str)
print('x' in str)
'''
    def __contains__(self, *args, **kwargs): # real signature unknown
        """ Return key in self. """
        pass
'''